如图,在梯形ABCD中,AD‖BC,AC与BD交于点O,若S△AOD=4,S△BOC=9,则S梯形ABCD=
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![如图,在梯形ABCD中,AD‖BC,AC与BD交于点O,若S△AOD=4,S△BOC=9,则S梯形ABCD=](/uploads/image/z/2395349-53-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%80%96BC%2CAC%E4%B8%8EBD%E4%BA%A4%E4%BA%8E%E7%82%B9O%2C%E8%8B%A5S%E2%96%B3AOD%3D4%2CS%E2%96%B3BOC%3D9%2C%E5%88%99S%E6%A2%AF%E5%BD%A2ABCD%3D)
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